Completion plug for well completion

ABSTRACT

This invention relates to a completion plug for well completion, comprising:A first attaching means (204) located between the upper part of a running tool (100) and a safety mean (200);A second attaching means (304) located between the middle part of the running tool (100) and a shearing mean (300);A third attaching means (422) located between the lower part of the running tool (100) and an equalizing mean (400) having an equalizing port (430) inside it;Wherein, in one embodiment, the completion plug is configured to equalize the well pressure by releasing the first attaching means (204) so that the equalizing shear sub (202) will reduce impact force between the equalizing means (400) and the inner of the running tool (100); and wherein the second attaching means (304) releases the running tool (100) to press an equalizing prong housing (450) connected to the lower end of the running tool (100) down in order to open the equalizing port (430) for equalizing pressure between the upper and the lower of the well.In another embodiment, the completion plug is configured to close the well by releasing the first attaching means (204) so that the equalizing shear sub (202) will reduce impact force between the equalizing means (400) and the inner of the running tool (100); and wherein the third attaching means (422) releases the equalizing means (400) from the running tool (100) in order to make the bottom sub (500) close the well when the well is not in use for production.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of and claims priority toInternational Application No. PCT/TH2019/000062, filed on Nov. 27, 2019,titled “Completion Plug for Well Completion,” which claims priority toThailand Application No. 1801007348 filed on Nov. 28, 2018, both ofwhich are incorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present invention relates to the field of engineering, inparticular, to the completion plug for well completion.

BACKGROUND OF THE INVENTION

Well completion is a step that operates after well logging, startingwith the installation of the casing hanger into the well and fixing theintermediate casing at the position close to the casing end. Cement isthen fed along the production tubing by reversing the flow of cementback through the space between the production tubing and the wellsidewall. This is done to separate the rock layer for producingpetroleum from the other rock layers, preventing other fluids from theother rock layer to become contaminated, and preventing the petroleumfrom the desired production layer to flow into the above or underneathrock layers. Next, the production tubing is fixed and moved into thewell at the desired depth.

After the well has been producing for a while, it is found that theproduction tubing is broken or there is obstacle in the tubing. The saiddamage significantly affects the production of the well. Therefore, theworkover/recompletion needs to be performed to increase the productionefficacy. After the recompletion, inspection is performed by sending theplug into the well. The plug should have a smaller diameter than theinternal tubing and said plug will expand inside the tubing at thedesired position in order to seal the tubing at the desired position.This seal obstructs the internal pressure and for testing the pressureof the liquid in the production tubing.

Before removing the plug to continue the production operation, pressuresbetween the upper and the lower part of the plug need to be equalized inorder to remove the plug easily and/or to prevent a pressure force thatcan jet up and cause a blow-out and fire danger.

Nevertheless, the completion plug for the pressure test tubing stringhas a problem in closing and opening of the pressure equalizing port.Therefore, attempts have been made to overcome said problem as stated inthe following documents.

U.S. Pat. No. 4,314,608 discloses a device for maintaining theproduction tube cooperating with the packer for plugging the pressure orseparating the isolate zone into two parts, which are the upper and thelower part of said device. This device comprises a plug that uses springforce to push between the shoulder of the internal part with the ball inorder to close the equalizing port, and the seating tool, which ischaracterized as the housing on the upper part of the plug. When thewell is needed to be plugged, the device is separated from the pluggingpart by the jarring down technique that shears the bolt fixed to bothmembers, and allows the plug to become fixed on the packer. When theplug is needed to be retrieved from the well, the positioning part withthe fishing neck is fed into the tubing to become fixed with the plug.Then the equalizing between the upper and the lower parts of the packeris performed using the jarring down technique to shear the bolt at thepositioning part in order to open the equalizing port of the plug.However, this patent does not disclose the protection part for theimpact occurring from the bolt shearing. Moreover, the closing of theequalizing port employs spring force that pushes the shoulder of theinternal part to the ball in order to resist pressure. The springbecomes fatigued from high workloads.

U.S. Pat. No. 5,054,558 discloses a valve device for equalizing thepressure between the production tubing and the casting comprising of thefirst part, which is the housing for supporting the up and down slidingmovement of the second member core for opening and closing theequalizing port; wherein the upper end of the second member core has astopper for limiting the movement of second member. There is the orificeat the core connecting to the passageway that goes through the lower endof the second member. When there is no pressure equalizing, the shearscrew fixes the first member to the second member. Nevertheless, whenthe screw is sheared with the jarring up technique, the second membermoves down from the first member to the end and equalizes the pressurebetween the production tubing and the casting. However, the opening ofthe equalizing port of said device is jarring up in order to tear theshear screw, which may causes damage to the core of the second member.Moreover, the equalizing port of said device is designed to be small andneeds a longer time when equalizing the different pressure between twopositions.

U.S. Pat. No. 4,928,761 discloses a two-way plug comprising: 1) therunning tool having an internal spring at the upper body and core insidethe body next to the spring, with a slidable pin for limiting themovement of the core in the body; and 2) the plugging device connectedto the lower part of the running tool comprising housing handle, whichis the hollow rod extending into the housing, and the plug member havinga spring covering and supporting the lowest part of the housing in orderto prevent the equalizing port from opening. When needed to equalize theisolation zone, the running tool is jarring down to press open theequalizing port in order to equalize said isolation zone. However, thestructure of said device is complicated and not suitable for workingunder high pressure conditions, including the time required to equalizein the isolation zone.

However, the plugs disclosed above have several limitations, especiallyin controlling the damage to the device and equalizing time.Additionally, the plugs disclosed above can only either equalize orplug. Therefore, this invention aims to develop the completion plug forwell completion which has damage protection parts to protect the deviceand internal members. Additionally, this invention aims to shorten theequalizing time, and allows the selection of shearing the attachingmeans for which either equalizing or plugging the production tubing canoccur.

SUMMARY OF INVENTION

The present invention relates to a completion plug for well completion

In one embodiment, the completion plug for equalizing pressure in wellcomprising: A first attaching means (204) located between the upper partof a running tool (100) and a safety means (200), the safety means (200)comprising a equalizing shear sub (202), and the running tool (100) hasinternal space that allows internal members to move up and down;

A second attaching means (304) located between the middle part of therunning tool (100) and a shearing means (300), the shearing means (300)comprising a shear retainer (302) for retaining shearing force that mayoccur between a fishing neck (410) and the inner of the running tool(100);

A third attaching means (422) located between the lower part of therunning tool (100) and an equalizing means (400), an equalizing means(400) comprising a equalizing body (420) having an equalizing port (430)inside it and the fishing neck (410) for fishing the shearing means(300) to the equalizing means (400);

Wherein the completion plug is configured to equalize the well pressureby releasing the first attaching means (204) so that the equalizingshear sub (202) will reduce impact force between the equalizing means(400) and the inner of the running tool (100); and

Wherein the second attaching means (304) releases the running tool (100)to press an equalizing prong housing (450) connected to the lower end ofthe running tool (100) down in order to open the equalizing port (430)for equalizing pressure between the upper and the lower of the well.

In another embodiment, the present invention relates to a completionplug for well completion, comprising:

A first attaching means (204) located between the upper part of arunning tool (100) and a safety means (200), the safety means (200)comprising a equalizing shear sub (202), and the running tool (100) hasinternal space that allows internal members to move up and down;

A second attaching means (304) located between the middle part of therunning tool (100) and a shearing means (300), the shearing means (300)comprising a shear retainer (302) for retaining shearing force that mayoccur between a fishing neck (410) and the inner of the running tool(100);

A third attaching means (422) located between the lower part of therunning tool (100) and an equalizing means (400), an equalizing means(400) comprising a equalizing body (420) having an equalizing port (430)inside it and the fishing neck (410) for fishing the shearing means(300) to the equalizing means (400);

Wherein the completion plug is configured to equalize the well pressureby releasing the first attaching means (204) so that the equalizingshear sub (202) will reduce impact force between the equalizing means(400) and the inner of the running tool (100); and

Wherein the third attaching means (422) releases the equalizing means(400) from the running tool (100) in order to make the bottom sub (500)close the well when the well is not in use for production.

The completion plug according to this invention has the damageprotection member to protect the device and members, fast equalizingtime, and can perform both equalizing and plugging, which are selectedfrom releasing the attaching means inside the device.

Any objectives and aspects of this invention will be clearer appear whenconsidered together with the appended drawings and the best mode orpreferred embodiment of the invention as described in the followings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an alignment of internal members of the completion plugaccording to the exemplary embodiment of this invention.

FIG. 2 shows cross-section of the internal members of the completionplug according to the exemplary embodiment of this invention.

FIG. 3 shows perspective view of the completion plug with according tothe exemplary embodiment of this invention that shows the internalmechanicals.

DESCRIPTION OF THE INVENTION

The present invention relates to a completion plug for well completion.

In one embodiment, the completion plug for equalizing pressure in wellcomprising: A first attaching means (204) located between the upper partof a running tool (100) and a safety means (200), the safety means (200)comprising a equalizing shear sub (202), and the running tool (100) hasinternal space that allows internal members to move up and down;

A second attaching means (304) located between the middle part of therunning tool (100) and a shearing means (300), the shearing means (300)comprising a shear retainer (302) for retaining shearing force that mayoccur between a fishing neck (410) and the inner of the running tool(100);

A third attaching means (422) located between the lower part of therunning tool (100) and an equalizing means (400), an equalizing means(400) comprising a equalizing body (420) having an equalizing port (430)inside it and the fishing neck (410) for fishing the shearing means(300) to the equalizing means (400);

Wherein the completion plug is configured to equalize the well pressureby releasing the first attaching means (204) so that the equalizingshear sub (202) will reduce impact force between the equalizing means(400) and the inner of the running tool (100); and

Wherein the second attaching means (304) releases the running tool (100)to press an equalizing prong housing (450) connected to the lower end ofthe running tool (100) down in order to open the equalizing port (430)for equalizing pressure between the upper and the lower of the well.

In another embodiment, the present invention relates to a completionplug for well completion, comprising:

A first attaching means (204) located between the upper part of arunning tool (100) and a safety means (200), the safety means (200)comprising a equalizing shear sub (202), and the running tool (100) hasinternal space that allows internal members to move up and down;

A second attaching means (304) located between the middle part of therunning tool (100) and a shearing means (300), the shearing means (300)comprising a shear retainer (302) for retaining shearing force that mayoccur between a fishing neck (410) and the inner of the running tool(100);

A third attaching means (422) located between the lower part of therunning tool (100) and an equalizing means (400), an equalizing means(400) comprising a equalizing body (420) having an equalizing port (430)inside it and the fishing neck (410) for fishing the shearing means(300) to the equalizing means (400);

Wherein the completion plug is configured to equalize the well pressureby releasing the first attaching means (204) so that the equalizingshear sub (202) will reduce impact force between the equalizing means(400) and the inner of the running tool (100); and

Wherein the third attaching means (422) releases the equalizing means(400) from the running tool (100) in order to make the bottom sub (500)close the well when the well is not in use for production.

Any aspects described herein are aimed to include the application to theother aspects of this invention, unless stated otherwise.

Technical terms or scientific terms used herein have definitions asunderstood by persons skilled in the art unless stated otherwise.

The use of singular noun or pronoun, or plural nouns or pronouns with“comprising” in the claims or in the specification refers to “one” andincluding “one or more”, “at least one”, and “one or more than one”.

Throughout this application, unless being stated otherwise:

Hereafter, detailed description of the invention will be describedwithout any purpose to limit any scope of the invention.

FIG. 1 shows an alignment of internal members of a completion plug forwell completion according to the present invention, wherein the runningtool (100) is a housing with internal space that allows a safety means(200), a shearing means (300), and an equalizing means (400) to beinside the running tool (100). The safety means (200), the shearingmeans (300), and the equalizing means (400) can be movable inside therunning tool (100). The safety means (200) comprises an equalizing shearsub (202) inside the top of the running tool (100). A shearing means(300), located under the safety means (200), comprises a shear retainer(302) which is a housing covering an equalizing means (400). Saidequalizing means (400) comprises a fishing neck (410) and an equalizingbody (420). The fishing neck (410) is located under the safety means(200), and is a cylinder shape having larger diameter of the upper endthan the lower part for fishing the shearing means (300). The equalizingbody (420) is a cylinder shape having equalizing port (430) inside it(not shown in FIG. 1). The upper end of the equalizing body (420) isattached to the lower end of the fishing neck (410), whereas the lowerend of the equalizing body (420) is attached to the bottom sub (500).

FIG. 2 shows a cross-section of the completion plug according to thisinvention. The upper part of the completion plug according to thisinvention has a first attaching means (204) which is a protruding part aprotruding part configured to be attached between the running tool (100)and the equalizing shear sub (202). The first attaching means (204)attaches the port (210) of the equalizing shear sub (202) inside therunning tool (100) in order to prevent the equalizing means (400) frommoving up. Moreover, the upper part of the completion plug according tothis invention further comprises a first moving means (206), which is aprotruding part configured to be attached between upper groove (108) ofthe running tool (100) and port (212) of the equalizing shear sub (202).Preferably, the port (212) can further comprises a set screw (208) forattaching the first moving means (206) to the port (212). When releasingthe first attaching means (204), the first moving means (206) will limitthe movement of the safety means (200) to move up and down within spaceof the upper groove (108).

Moreover, as shown in FIG. 2, the middle part of the completion plugaccording to this invention has a second attaching means (304) which isa protruding part configured to be attached between the running tool(100) and a shear retainer (302) via port (308) of the shear retainer(302). The shear retainer (302) covers on the fishing neck (410) at theneck 412. Also, the second attaching means (304) attaches the shearingmeans (300) next to the equalizing means (400) to be immobilized.

Moreover, the lower part of the completion plug according to thisinvention as shown in FIG. 2 has a third attaching means (422) which isan attaching part configured to be attached between the lower part ofthe running tool (100) and port 414 of the fishing neck (410) and port(426) of the equalizing body (420). The third attaching means (422)attaches the equalizing body (420) in order not to be separated from therunning tool (100) and the fishing neck (410). Moreover, the lower partof the completion plug according to this invention also has a thirdmoving means (424) which is a protruding part configured to be attachedbetween an equalizing prong housing (450) and position (428) of theequalizing body (420). The third moving means (424) blocks and releasesthe equalizing prong housing (450). The equalizing prong housing (450)is an open end pipe located under the running tool (100) and coveringthe equalizing body (420). The equalizing body (420) has an equalizingport (430) which is the open port connected to the hollow channel (432)laid inside the equalizing body at the middle part. Preferably, theupper and lower part of the equalizing port (430) has a seal ring 440for preventing the pressure leak, while the equalizing prong housing(450) is configured to close the equalizing port (430). On the otherhand, if the equalizing prong housing (450) has been released, therewill be the equalizing of different pressure between the upper and thelower part of the device according to this invention via the equalizingport (430) and the hollow channel (432). Moreover, at the bottom part ofthe equalizing prong housing (450), there is an adjusting nut (460)covering on the equalizing body (420) for limiting the moving distanceof the equalizing prong housing (450). Also, there is the bottom sub(500) attached to the lowest end of the equalizing means (400) forconnecting to the underneath devices.

FIG. 3 shows a perspective view, which exhibits the internal mechanismof the completion plug according to this invention. The first attachingmeans (204) at the upper part of the completion plug according to thisinvention is a protruding part configured to be attached between therunning tool (100) and the equalizing shear sub (202) in order to attachmembers together via the upper port (102) of the running tool (100) andport (210) (shown in FIG. 2) of the equalizing shear sub (202).

The second moving means (306), at the center of the completion plugaccording to this invention, is a protruding part configured to beattached between the lower groove (110) of the running tool (100) andthe shear retainer (302) in order to limit the movement of the shearingmeans (300) attached to the equalizing means (400) to move up and downwithin the lower groove (110) when releasing the second attaching means(304), configured to be attached between the center port 104 of therunning tool (100) and the shear retainer (302).

The third moving means (424), at the lower part of the completion plugaccording to this invention, is a protruding part configured to beattached between a equalizing groove (452) of the equalizing pronghousing (450) and the position (428) (shown in FIG. 2) of the equalizingbody (420). The third moving means (424) blocks the equalizing pronghousing (450) when it is in the blocking position (453) while releasingthe equalizing prong housing (450) when it is in the releasing position(454) in order to equalize the different pressure between the upper andthe lower parts of the completion plug according to this invention viathe equalizing port (430).

According to the specification, the completion plug in this invention isconfigured to equalize the pressure of the petroleum well by “jarringdown” technique via the wireline or cable control connected to thecompletion plug at the upper end of the running tool (100) for releasingthe first attaching means (204). This makes the equalizing shear sub(202) to be able to move up and down within the upper groove (108) bythe first moving means (206) in order to reduce the impact force betweenthe equalizing means (400) and the internal part of the running tool(100). The jarring down also releases the second attaching means (304)that makes the running tool (100) to be able to move down to press theequalizing prong housing (450) when the third moving means (424) is inthe releasing position (454) to open the equalizing port (430) in orderto equalize the different pressure between the upper and the lower partsof the completion plug according to the present invention.

In one embodiment of the present invention, the completion plugaccording to this invention is configured to equalize the pressure ofthe

well, comprising:

the first attaching means (204) located between the upper part of therunning tool (100) and the safety means (200) is released in order tomake the safety means (200) to move to be able to reduce the impactforce between the equalizing means (400) and the internal part of therunning tool (100);

the second attaching means (304) located between the middle part of therunning tool (100) and the shearing means (300) is released in order tomake the running tool (100) to be movable;

the third attaching means (422) located between the lower part of thefishing neck (410) and the upper part of the equalizing body (420) ofthe equalizing mean (400), wherein the fishing neck (410) is locatednext to the safety means (200) and having neck (412) fished to theshearing means (300), wherein the running tool (100) is moved down inorder to press the equalizing prong housing (450) at the third movingmeans (424) to the releasing position 454 in order to open theequalizing port (430) for equalizing the different pressure of the wellbetween the upper and the lower parts of the completion plug.

In one embodiment of the present invention, a method for configuring thecompletion plug according to this invention to equalize the pressure ofthe well comprises steps of:

1. Dropping the completion plug according to this invention, of which isconnected to the wireline or cable at the upper end position of therunning tool (100), into the well in order to install said device in thearea desired to separate the tubing system, wherein the bottom sub (500)of the completion plug is connected to the other devices used for wellcompletion inside the well.

2. Adjusting the position of the third moving means (424) in theequalizing (452) to be in the releasing position (454) by controllingvia the wireline or cable.

3. Releasing the first attaching means (204) and the second attachingmeans (304) by jarring down technique by controlling via the wireline orcable.

4. Jarring down, in order to move the running tool (100) down, to pressthe equalizing prong housing (450) to open the equalizing port (430) forequalizing the different pressure between the upper and the lower partsof said device.

According to the specification, the completion plug according to thisinvention is configured to close the well by jarring down technique viathe control of wireline or cable connected to the upper end position ofthe running tool (100) to release the first attaching means (204). Thisenable the equalizing shear sub (202) to move up and down within theupper groove (108) by the first moving means (206) in order to reducethe impact force between the equalizing means (400) and the running tool(100). The jarring down also releases the third attaching means (422)making the equalizing means (400) and the bottom sub (500) under theequalizing body (410) to be released and separated from the running tool(100) to close the well when not in use or before the well is opened forproduction.

In one embodiment of the present invention, the completion plugaccording to this invention is configured to close the well, comprising:

the first attaching means (204) located between the upper part of therunning tool (100) and the safety means (200) is released in order tomake the safety means (200) movable to reduce the impact force betweenthe equalizing means (400) and internal of the running tool (100);

the second attaching means (304) located between the middle part of therunning tool (100) and the shearing means (300); and

the third attaching means (422) located between the lower part of therunning tool (100) and the equalizing means (400), releasing andseparating the bottom sub (500) at the lower part of the equalizing body(410) from the running tool (100), in order to close the well when saidwell is not in use or before the well is opened for production.

In one embodiment of the present invention, a method for configuring thecompletion plug according to this invention to close the well comprisessteps of:

1. Dropping the completion plug according to this invention, of which isconnected to the wireline or cable at the upper end position of therunning tool (100), into the well in order to install said device in thearea desired to separate the tubing system, wherein the bottom sub (500)of the completion plug is connected to the other devices used for wellcompletion inside the well.

2. Releasing the first attaching means (204) and the third attachingmeans (422) by jarring down technique by controlling via the wireline orcable.

BEST MODE OF THE INVENTION

Best mode or preferred embodiment of the invention is as provided in thedescription of the invention.

What is claimed is:
 1. A completion plug for well completion,comprising: a first attaching means (204) located between the upper partof a running tool (100) and a safety means (200), the safety means (200)comprising a equalizing shear sub (202), and the running tool (100) hasinternal space that allows internal members to move up and down; asecond attaching means (304) located between the middle part of therunning tool (100) and a shearing means (300), the shearing means (300)comprising a shear retainer (302) for retaining shearing force that mayoccur between a fishing neck (410) and the inner of the running tool(100); a third attaching means (422) located between the lower part ofthe running tool (100) and an equalizing means (400), an equalizingmeans (400) comprising a equalizing body (420) having an equalizing port(430) inside it and the fishing neck (410) for fishing the shearingmeans (300) to the equalizing means (400); wherein the completion plugis configured to equalize the well pressure by releasing the firstattaching means (204) so that the equalizing shear sub (202) will reduceimpact force between the equalizing means (400) and the inner of therunning tool (100); and wherein the second attaching means (304)releases the running tool (100) to press an equalizing prong housing(450) connected to the lower end of the running tool (100) down in orderto open the equalizing port (430) for equalizing pressure between theupper and the lower of the well.
 2. The completion plug according toclaim 1, wherein the first attaching means (204) is a protruding partfor attaching the safety means (200) in the upper part of the runningtool (100) to prevent the safety means (200) from moving up and down inthe running tool (100).
 3. The completion plug according to claim 1,wherein the safety means (200) is a supporting part for preventing theequalizing means (400) from moving up and comprising the equalizingshear sub (202) having a position (210) to support the first attachingmeans (204).
 4. The completion plug according to claim 3, wherein thesafety means (200) further comprises a first moving means (206) locatedbetween an upper groove (108) of the running tool (100) and the safetymeans (200) in order to limit the movement of the safety means (200)when releasing the first attaching means (204).
 5. The completion plugaccording to claim 1, wherein the second attaching means (304) is aprotruding part for attaching the shearing means (300) at the centerposition of the running tool (100) in order to prevent the shearingmeans (300) from moving up and down in the running tool (100).
 6. Thecompletion plug according to claim 1, wherein the shearing means (300)is a housing for suspending the fishing neck (410) to attach the fishingneck (410) in the running tool (100) and comprises the shear retainer(302) in a position (308) for supporting the second attaching means(304).
 7. The completion plug according to claim 6, wherein the shearingmeans (300) further comprises a second moving means (306) locatedbetween a lower groove (110) of the running tool (100) and the shearingmeans (300) in order to limit the movement of the shearing means (300)when releasing the second attaching means (304).
 8. The completion plugaccording to claim 1, wherein the third attaching means (422) is anattaching part for attaching the equalizing means (400) at the lowerpart of the running tool (100) in order to prevent the equalizing means(400) to be detached from the running tool (100).
 9. The completion plugaccording to claim 1, wherein the equalizing means (400) comprises thefishing neck (410), having a neck (412) fished to the shearing means(300), in order to suspend the equalizing means (400) and the equalizingbody (420), which is attached to the lower part of the fishing neck(410) by the third attaching means (422).
 10. The completion plugaccording to claim 1, wherein the equalizing means (400) equalizespressure between the upper and the lower of the well through theequalizing body (420) having the equalizing port (430) inside, theequalizing port (430) connected to the hollow channel (432) laid insidethe equalizing body (420).
 11. The completion plug according to claim 1,wherein the equalizing means (400) further comprises a seal ring (440)at the upper and the lower position of the equalizing port (430) inorder to protect pressure leak when covering with the equalizing pronghousing (450).
 12. The completion plug according to claim 9, wherein theequalizing means (400) further comprises a third moving means (424)located between an equalizing groove (452) of the equalizing pronghousing (450) and the position (428) of the equalizing body (420), athird moving means (424) located at a blocking position (453) when thereis no releasing of the first attaching means (204) and the secondattaching means (304).
 13. The completion plug according to claim 9,wherein the equalizing means (400) further comprises a third moving mean(424) located between an equalizing groove (452) of the equalizing pronghousing (450) and the position (428) of the equalizing body (420), thethird moving means (424) located at a releasing position (454) whenreleasing of the first attaching means (204) and the second attachingmeans (304).
 14. The completion plug with according to claim 1, whereinthe equalizing means (400) further comprises an adjusting nut (460)covering on the equalizing body (420) under the equalizing prong housingfor limiting the movement of the equalizing prong housing (450).
 15. Thecompletion plug according to claim 1, wherein the equalizing means (400)further comprises a bottom sub (500) at the lowest part of theequalizing means (400) for connecting with the underneath devices. 16.The completion plug according to claim 1, wherein said device isconfigured to equalize the pressure of the well, comprising: the firstattaching means (204) located between the upper part of the running tool(100) and the safety means (200) that is released to make the safetymeans (200) be moveable for reducing an impact force between theequalizing means (400) and the inner of the running tool (100); thesecond attaching means (304) located between the middle part of therunning tool (100) and the shearing means (300) that is released to makethe running tool (100) be movable; the third attaching means (422)located between the lower part of the fishing neck (410) and the upperpart of the equalizing body (420), the fishing neck (410) locatedadjacent to the safety mean (200) and having neck (412) fished to theshearing means (300); wherein the running tool (100) is moved down inorder to press the equalizing prong housing (450) connected to the lowerend of the running tool (100) for opening the equalizing port (430) inorder to equalize the different pressure of the well between the upperand the lower parts of said device.
 17. The completion plug according toclaim 16, wherein the completion plug is configured to equalize the wellpressure by the jarring down the running tool (100) in order to releasethe first attaching means (204) and the second attaching means (304).18. The completion plug according to claim 16, wherein the safety means(200) further comprises a first moving means (206) located between anupper groove (108) of the running tool (100) and the safety means (200)for limiting the movement of the safety means (200) in the running tool(100).
 19. The completion plug according to claim 16, wherein theshearing means (300) further comprises a second moving means (306)located between a lower groove (110) of the running tool (100) and theshearing means (300) for limiting the movement of the shearing mean(300) in the running tool (100).
 20. The completion plug according toclaim 16, wherein the equalizing means (400) having the equalizing port(430) inside, the equalizing port (430) connected to the hollow channel(432) laid inside the equalizing body (420).
 21. The completion plugaccording to claim 16, wherein the equalizing means (400) furthercomprises a third moving mean (424) located between an equalizing groove(452) of the equalizing prong housing (450) and the position (428) ofthe equalizing body (420) for releasing the equalizing prong housing(454).
 22. The completion plug according to claim 16, wherein theequalizing means (400) further comprises an adjusting nut (460) coveringthe equalizing body (420) under the equalizing prong housing forlimiting the movement of the equalizing prong housing (450).
 23. Thecompletion plug according to claim 16, wherein the equalizing means(400) further comprises a bottom sub (500) at the lowest part of theequalizing mean (400) for connecting with the underneath devices
 24. Thecompletion plug according to claim 1, wherein the first attaching means(204), the second attaching means (304), and the third attaching means(422) are selected from bolt, screw, or hook.
 25. A completion plug forwell completion, comprising: a first attaching means (204) locatedbetween the upper part of a running tool (100) and a safety means (200),the safety means (200) comprising a equalizing shear sub (202), and therunning tool (100) has internal space that allows internal members tomove up and down; a second attaching means (304) located between themiddle part of the running tool (100) and a shearing means (300), theshearing means (300) comprising a shear retainer (302) for retainingshearing force that may occur between a fishing neck (410) and the innerof the running tool (100); a third attaching means (422) located betweenthe lower part of the running tool (100) and an equalizing means (400),an equalizing means (400) comprising a equalizing body (420) having anequalizing port (430) inside it and the fishing neck (410) for fishingthe shearing means (300) to the equalizing means (400); wherein thecompletion plug is configured to close the well pressure by releasingthe first attaching means (204) so that the equalizing shear sub (202)will reduce impact force between the equalizing means (400) and theinner of the running tool (100); and wherein the third attaching means(422) releases the equalizing means (400) from the running tool (100) inorder to make a bottom sub (500) close the well when the well is not inuse for production.
 26. The completion plug according to claim 25,wherein the first attaching means (204) is a protruding part forattaching the safety means (200) in the upper part of the running tool(100) to prevent the safety means (200) from moving up and down in therunning tool (100).
 27. The completion plug according to claim 25,wherein the safety means (200) is a supporting part for preventing theequalizing means (400) from moving up and comprising the equalizingshear sub (202) having a position (210) to support the first attachingmeans (204).
 28. The completion plug according to claim 27, wherein thesafety means (200) further comprises a first moving means (206) locatedbetween an upper groove (108) of the running tool (100) and the safetymeans (200) in order to limit the movement of the safety means (200)when releasing the first attaching means (204).
 29. The completion plugaccording to claim 25, wherein the second attaching means (304) is aprotruding part for attaching the shearing means (300) at the centerposition of the running tool (100) in order to prevent the shearingmeans (300) from moving up and down in the running tool (100).
 30. Thecompletion plug according to claim 25, wherein the shearing means (300)is a housing for suspending the fishing neck (410) to attach the fishingneck (410) in the running tool (100) and comprises the shear retainer(302) in a position (308) for supporting the second attaching means(304).
 31. The completion plug according to claim 30, wherein theshearing means (300) further comprises a second moving means (306)located between a lower groove (110) of the running tool (100) and theshearing means (300) in order to limit the movement of the shearingmeans (300) when releasing the second attaching means (304).
 32. Thecompletion plug according to claim 25, wherein the third attaching means(422) is an attaching part for attaching the equalizing means (400) atthe lower part of the running tool (100) in order to prevent theequalizing means (400) to be detached from the running tool (100). 33.The completion plug according to claim 25, wherein the equalizing means(400) comprises the fishing neck (410), having a neck (412) fished tothe shearing means (300), in order to suspend the equalizing means (400)and the equalizing body (420), which is attached to the lower part ofthe fishing neck (410) by the third attaching means (422).
 34. Thecompletion plug according to claim 25, wherein the equalizing means(400) equalizes pressure between the upper and the lower of the wellthrough the equalizing body (420) having the equalizing port (430)inside, the equalizing port (430) connected to the hollow channel (432)laid inside the equalizing body (420).
 35. The completion plug accordingto claim 25, wherein the equalizing means (400) further comprises a sealring (440) at the upper and the lower position of the equalizing port(430) in order to protect pressure leak when covering with an equalizingprong housing (450).
 36. The completion plug according to claim 33,wherein the equalizing means (400) further comprises a third movingmeans (424) located between an equalizing groove (452) of an equalizingprong housing (450) and the position (428) of the equalizing body (420),the third moving means (424) located at a blocking position (453) whenthere is no releasing of the first attaching means (204) and the secondattaching means (304).
 37. The completion plug according to claim 33,wherein the equalizing means (400) further comprises a third moving mean(424) located between an equalizing groove (452) of an equalizing pronghousing (450) and the position (428) of the equalizing body (420), thethird moving means (424) located at a releasing position (454) whenreleasing of the first attaching means (204) and the second attachingmeans (304).
 38. The completion plug according to claim 25, wherein theequalizing means (400) further comprises an adjusting nut (460) coveringon the equalizing body (420) under an equalizing prong housing forlimiting the movement of the equalizing prong housing (450).
 39. Thecompletion plug according to claim 25, wherein the equalizing means(400) further comprises a bottom sub (500) at the lowest part of theequalizing means (400) for connecting with the underneath devices. 40.The completion plug according to claim 25, wherein said device isconfigured to equalize the pressure of the well, comprising: the firstattaching means (204) located between the upper part of the running tool(100) and the safety means (200) that is released to make the safetymeans (200) be moveable for reducing an impact force between theequalizing means (400) and the inner of the running tool (100); thesecond attaching means (304) located between the middle part of therunning tool (100) and the shearing means (300) that is released to makethe running tool (100) be movable; and the third attaching means (422)located between the lower part of the running tool (100) and theequalizing means (400) wherein the separating the equalizing means (400)is separated from the running tool (100) by releasing the thirdattaching means (422) such that the bottom sub (500) close the well whensaid well is not in use for production.
 41. The completion plugaccording to claim 40, wherein the completion plug is configured toclose the well by the jarring down of the running tool (100) to releasethe first attaching means (204) and the third attaching means (422). 42.The completion plug according to claim 40, wherein the safety means(200) further comprises a first moving means (206) located between anupper groove (108) of the running tool (100) and the safety means (200)for limiting the movement of the safety means (200) in the running tool(100).
 43. The completion plug according to claim 40, wherein theshearing means (300) further comprises a second moving means (306)located between a lower groove (110) of the running tool (100) and theshearing means (300) for limiting the movement of the shearing means(300) in the running tool (100).
 44. The completion plug according toclaim 40, wherein the equalizing means (400) has the equalizing port(430) inside, the equalizing port (430) connected to the hollow channel(432) laid inside the equalizing body (420).
 45. The completion plugaccording to claim 40, wherein the equalizing means (400) furthercomprises a third moving means (424) located between an equalizinggroove (452) of an equalizing prong housing (450) and the position (428)of the equalizing body (420) for blocking the equalizing prong housing(453).
 46. The completion plug according to claim 45, wherein theequalizing means (400) further comprises an adjusting nut (460) coveringthe equalizing body (420) under the equalizing prong housing forlimiting the movement of the equalizing prong housing (450).
 47. Thecompletion plug according to claim 40, wherein the equalizing means(400) further comprises the bottom sub (500) at the lowest part of theequalizing means (400) for connecting with the underneath devices. 48.The completion plug according to claim 1, wherein the first attachingmeans (204), the second attaching means (304), and the third attachingmeans (422) are selected from bolt, screw, or hook.
 49. A method forequalizing the pressure of the well according to claim 1, comprisingsteps of: installing the completion plug by connecting a bottom sub(500) to the devices inside the production tubing; adjusting theposition of a third moving means (424) to release the equalizing pronghousing (450); releasing the first attaching means (204) and the secondattaching means (304); and releasing the running tool (100) in order topress the equalizing prong housing (450) down to open the equalizingport (430).
 50. The method according to claim 49, wherein the releasingof the first attaching means (204) and the second attaching means (304)are released by jarring down the running tool (100).
 51. A method forclosing the well according to claim 25, comprising steps of: installingthe completion plug by connecting the bottom sub (500) to the devicesinside the production tubing; and releasing the first attaching means(204) and the third attaching means (422).
 52. The method according toclaim 51, the releasing of the first attaching means (204) and thesecond attaching means (304) are released by jarring down the runningtool (100).